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Old 16 August 2012, 17:54   #130
Retired Quartex Sysop
Methanoid's Avatar
Join Date: Sep 2001
Location: Roman Verulamium
Age: 50
Posts: 1,560
Originally Posted by Schoenfeld View Post
It's not software-selectable, but putting a wire link between two spots. This will change the CPU clock divisor from 3 to 2. The crystal on the board is 50MHz and remains in place. The design is fully async, meaning that the CPU runs async to the A1200 and the memory controller runs async to the CPU.

Could you do the same tests that I have made? I mean bustest and sysinfo. I'd like to know how much faster the Blizzard 1220 is.


In summary

B1220 default 28mhz = 4851
ACA1220 16.67mhz = 3321
ACA1220 25mhz OC = 4262

For me, I'd be happy with an OC ACA1220 with all that extra Ram!!

Would have been a nice feature if Jens had given us a jumper block rather than needing to solder a wire in place (mk2 maybe???)
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